Working machine

Abstract

To improve convenience of a working machine.SOLUTION: A hammer drill includes a handle part housing 12 for supporting a motor, a battery mounting part housing 16, and an elastic body 21 interposed between the handle part housing 12 and the battery mounting part housing 16. The handle housing 12 has a handle upper sidewall part 12a located above the elastic body 21 and a handle lower sidewall part 12b located below the elastic body 21. The battery mounting part housing 16 has a battery mounting part lower sidewall part 12a positioned on the lower side of the elastic body 21 and interposing the elastic body 21 with the handle part upper sidewall part 16a, and a battery mounting part upper sidewall part 12b positioned on the upper side of the elastic body 21 and interposing the elastic body 21 with the handle part lower sidewall part 16b.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a work machine equipped with a motor. [Background technology]

[0002] BACKGROUND ART As an example of a work machine, a work machine has been proposed that includes a motor, a tool bit driven by the motor, and a battery pack that supplies power to the motor.

[0003] For example, Patent Document 1 discloses an electrical device having a first housing that houses a motor, a second housing that has one end connected to the first housing and the other end to which a battery pack is connected, and an elastic body that is interposed between the first housing and the second housing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 065088 Summary of the Invention [Problem to be solved by the invention]

[0005] In the electrical device described in Patent Document 1, the elastic body is sandwiched between the first housing and the second housing and is compressed and deformed in the left-right direction. Therefore, although the elastic body provides a vibration reduction effect in the left-right direction, the elastic body is shear deformed in the up-down direction, so the vibration reduction effect obtained is smaller than in the left-right direction.

[0006] It is possible to achieve vibration reduction in multiple directions by placing elastic bodies in both the up, down, left, and right directions, but this would result in the elastic bodies becoming larger or the number of parts increasing, which could lead to an increase in the size of the entire product (work machine) and a loss of convenience.

[0007] An object of the present invention is to provide a work machine with improved convenience. [Means for solving the problem]

[0008] A work machine according to one embodiment includes a motor, an operating unit that operates upon receiving a driving force from the motor, a first housing that supports the motor, a second housing that is connected to the first housing, and an elastic body that is interposed between the first housing and the second housing, wherein the first housing includes a first one side wall portion that is located on one side of the elastic body in a first direction, The second housing has a first other-side wall portion located on the other side of the elastic body in the first direction, and a second other-side wall portion located on the other side of the elastic body in the first direction and interposing the elastic body between itself and the first one-side side wall portion, and a second one-side wall portion located on one side of the elastic body in the first direction and interposing the elastic body between itself and the first other-side side wall portion.

[0009] A work machine according to another embodiment includes a motor, an operating unit that operates upon receiving a driving force from the motor, a first housing that supports the motor, a second housing that is connected to the first housing, and an elastic body that is interposed between the first housing and the second housing, wherein the first housing has a first base and a protruding portion that protrudes from the first base so as to be connected to the first base on one side in a first direction, and the second housing has a second base and a protruding portion that is provided on the second base and is inserted into the other side in the first direction. the protrusion has a first one-side wall portion extending in a second direction intersecting the first direction, the hole portion has a second other-side wall portion extending in the second direction and located on the other side of the first direction relative to the first one-side wall portion, and sandwiching the elastic body between the first one-side wall portion and the hole portion, and the first housing and the second housing are provided with a separation prevention portion that prevents the protrusion from separating from the hole portion by abutting the first housing and the second housing without the elastic body being interposed therebetween. [Effects of the Invention]

[0010] According to the present invention, the convenience of the work machine can be improved. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side cross-sectional view showing the structure of a working machine according to a first embodiment of the present invention. [Figure 2] 2 is an exploded perspective view of a handle portion, a battery mounting portion, and a battery pack of the work machine shown in FIG. 1. FIG. [Figure 3] 2 is a side view showing the structure of a handle portion, a battery mounting portion, and a battery pack of the work machine shown in FIG. 1. [Figure 4] FIG. 4 is a cross-sectional view showing the structure taken along line AA shown in FIG. [Figure 5] 4 is a cross-sectional view showing the structure cut along line BB shown in FIG. [Figure 6] FIG. 2 is a rear view of the structure of the work machine shown in FIG. 1, as seen from the rear. [Figure 7] FIG. 7 is a cross-sectional view showing the structure cut along line CC shown in FIG. [Figure 8] FIG. 7 is a cross-sectional view showing the structure cut along line DD shown in FIG. [Figure 9] 8 is a cross-sectional view showing the structure taken along line EE shown in FIG. 7. [Figure 10] FIG. 8 is a cross-sectional view showing the structure cut along line FF shown in FIG. [Figure 11] FIG. 10 is a cross-sectional view showing the structure cut along line GG shown in FIG. [Figure 12] FIG. 4 is a side cross-sectional view showing the structure of a working machine according to a second embodiment of the present invention. [Figure 13] 13 is a cross-sectional view showing the structure cut along the line AA shown in FIG. 12. [Figure 14] 13 is a cross-sectional view showing the structure cut along line BB shown in FIG. 12. [Figure 15] FIG. 13 is a perspective view showing the structure of a handle portion of the work machine shown in FIG. [Figure 16]13 is a perspective view showing the structure of a battery mounting portion of the work machine shown in FIG. 12. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

[0013] In this embodiment, a hammer drill will be described as an example of a work machine.

[0014] The use of the hammer drill according to this embodiment is not particularly limited, but it is suitable for drilling holes in objects such as concrete walls and stone, and for breaking down objects.

[0015] (Embodiment 1) As shown in FIG. 1, a hammer drill (working machine) 10 includes a working machine body 1, an electric motor 19 as a power source, and a tool bit 8 that can contact a workpiece. The tool bit 8 is, for example, a bit, and is detachably attached to the working machine body 1. The hammer drill 10 also includes a drive unit 4 disposed below the working machine body 1 and a handle unit 2 connected to the working machine body 1. The outer shell of the working machine body 1 is composed of a cylinder housing 1a, an intermediate housing 1b, and a motor housing 1c, which are fixed to each other and integrated. The handle unit 2 is gripped by the operator and includes a handle unit housing (first housing) 12 that forms the outer shell of the hammer drill 10. In other words, the hammer drill 10 includes the cylinder housing 1a, the intermediate housing 1b, the motor housing 1c, and the handle unit housing 12 as the first housing that forms the outer shell of the hammer drill 10.

[0016] The cylinder housing 1a is cylindrical as a whole. The intermediate housing 1b and the motor housing 1c are disposed between one longitudinal end of the cylinder housing 1a and the handle portion 2. In the following description, the longitudinal direction of the cylinder housing 1a is defined as the front-to-rear direction P1. Of the two longitudinal sides of the cylinder housing 1a, the side where the intermediate housing 1b and the motor housing 1c are disposed is defined as the rear, and the opposite side is defined as the front. In other words, the intermediate housing 1b and the motor housing 1c are disposed between the rear end of the cylinder housing 1a and the handle portion 2.

[0017] The intermediate housing 1b and the motor housing 1c are stacked one on top of the other, with one end of the handle section 2 connected to the motor housing 1c and the other end of the handle section 2 connected to the intermediate housing 1b. In the following description, the other end of the handle section 2 connected to the intermediate housing 1b is defined as the upper end, and the one end of the handle section 2 connected to the motor housing 1c is defined as the lower end. In other words, the direction in which the handle section 2 extends is defined as the up-down direction (first direction) Q1 perpendicular to the front-rear direction P1. Furthermore, the direction perpendicular to the front-rear direction P1 and the up-down direction Q1 is defined as the left-right direction (second direction) R1 (see FIG. 2).

[0018] The hammer drill 10 also has a rotational force transmission unit 14 that applies a rotational force to the tool bit 8 using the driving force of the motor 19, an impact force transmission unit 15 that applies an impact force to the tool bit 8 using the driving force of the motor 19, and a control unit 13 that controls the rotational force and impact force transmitted to the tool bit 8. The control unit 13 controls the driving force of the motor 19, thereby controlling the rotational force and impact force transmitted to the tool bit 8.

[0019] The cylinder housing 1a accommodates a cylindrical cylinder 17 and a retainer sleeve 25 as the rotational force transmission unit 14. The cylinder 17 and the retainer sleeve 25 are concentric, and the tool holder 7, which is part of the retainer sleeve 25, protrudes from the tip of the cylinder housing 1a. The cylinder 17 and the retainer sleeve 25 are engaged with each other so that they cannot rotate relative to each other, and when a rotational force is transmitted to the cylinder 17, the cylinder 17 and the retainer sleeve 25 rotate together around the axis C1 as the rotation axis.

[0020] Furthermore, a portion of the tool bit 8 is inserted into the tool bit holder 7 of the retainer sleeve 25, and the tool bit 8 is supported by the retainer sleeve 25. The tool bit 8 inserted into the tool bit holder 7 of the retainer sleeve 25 is engaged with the retainer sleeve 25 so as to be immovable in the rotational direction but movable within a predetermined range in the front-to-rear direction P1. Therefore, when the cylinder 17 and the retainer sleeve 25 rotate, the tool bit holder 7 of the retainer sleeve 25 also rotates, and as a result, a rotational force is transmitted to the tool bit 8, causing the tool bit 8 to rotate.

[0021] Meanwhile, the piston 9, striker (impactor) 22, and second hammer (intermediate element) 24 are housed within the cylinder 17 so as to be able to reciprocate as part of the striking force transmission section 15. The second hammer 24 is housed straddling the cylinder 17 and a retainer sleeve 25. The piston 9, striker 22, and second hammer 24 are aligned in this order from the rear to the front of the cylinder 17. Furthermore, an air chamber 23 is provided within the cylinder 17 between the piston 9 and the striker 22 as part of the striking force transmission section 15.

[0022] Therefore, as the piston 9 reciprocates, a striking force is transmitted to the tool bit 8 by the striker 22 and the second hammer 24 via the air chamber 23. That is, the striking force transmission unit 15 includes the air chamber 23, and transmits a striking force to the tool bit 8 by the pressure of the compressed air 20 in the air chamber 23 interposed between the piston 9 and the striker 22. In other words, the striking force transmission unit 15 includes a cylinder 17 in which the air chamber 23 can be formed, a piston 9 that reciprocates within the cylinder 17, a striker 22 that is a striker that moves following the reciprocation of the piston 9 and strikes the second hammer 24, and the second hammer 24 that is an intermediate element that strikes the tool bit 8. In this configuration, the striking force is transmitted to the second hammer 24 by the striker 22 that follows the reciprocation of the piston 9 via the compressed air 20. In detail, the reciprocation of the piston 9 changes the pressure of the compressed air 20 in the air chamber 23, and this pressure change causes the striker 22 to move back and forth. Then, the striking force is transmitted to the tip tool 8 by the second hammer 24 that has been struck by the striker 22 .

[0023] When an impact force is transmitted to the bit 8, the bit 8 reciprocates within a predetermined range in the forward and backward direction P1, applying an impact force to the mating material. The bit 8 has a generally cylindrical shape extending along the axis C1, and is a bit that moves in the forward and backward direction P1 by the driving force of the motor 19 to perform the desired work.

[0024] The electric motor 19 is housed in the drive unit 4 within the motor housing 1c. In other words, the motor 19 is supported by the motor housing 1c. The motor 19 is, for example, an inner-rotor brushless motor, and includes a cylindrical stator 19a, a rotor 19b disposed inside the stator 19a, and an output shaft 19c disposed inside the rotor 19b. The output shaft 19c is fixed to the rotor 19b and extends vertically through the rotor 19b. The axis D1 of the output shaft 19c is perpendicular to the axis C1 of the cylinder 17 and the retainer sleeve 25.

[0025] The upper part of the output shaft 19c protruding from the rotor 19b penetrates the partition wall between the motor housing 1c and the intermediate housing 1b and enters the inside of the intermediate housing 1b. A fan 19d is provided on the upper end of the output shaft 19c protruding into the intermediate housing 1b, and a pinion gear 19e is provided at the upper end. Within the intermediate housing 1b, a first drive shaft 30 is rotatably disposed on one side of the output shaft 19c, and a second drive shaft 40 is rotatably disposed on the other side of the output shaft 19c. The output shaft 19c, first drive shaft 30, and second drive shaft 40 are parallel to one another.

[0026] A first gear 31 that meshes with the pinion gear 19e is provided at the bottom of the first drive shaft 30, and an eccentric pin 32 is provided at the top of the first drive shaft 30. The eccentric pin 32 is connected to the piston 9 via a connecting rod 33. In other words, the connecting rod 33 and the piston 9 are provided as the reciprocating mechanism 18.

[0027] A second gear 41 that meshes with the pinion gear 19e is provided on the lower part of the second drive shaft 40, and a bevel gear 42 is provided on the upper part of the second drive shaft 40, and this bevel gear 42 meshes with a ring gear 43 that is arranged around the cylinder 17. The ring gear 43 is attached to the outer peripheral surface of the cylinder 17 and rotates freely relative to the cylinder 17.

[0028] In addition to the ring gear 43, a clutch 44 is provided on the outer peripheral surface of the cylinder 17. The clutch 44 rotates integrally with the cylinder 17 and slides independently in the axial direction of the cylinder 17 (front-rear direction P1). When the clutch 44 slides rearward, it engages with the ring gear 43 and transmits rotation to the cylinder 17. In other words, in the hammer drill 10, the piston 9 and cylinder 17, along with the gears, are operating parts that operate by receiving the driving force of the motor 19.

[0029] A battery mounting section 26 connected to the handle section 2 is provided at the bottom of the handle section 2. The battery mounting section 26 includes a battery mounting section housing (second housing) 16 that forms the outer shell of the battery mounting section 26. A battery pack 3, which is a power source, can be attached to the battery mounting section 26. The battery pack 3 supplies power to the motor 19.

[0030] The handle portion 2 is also provided with a trigger switch 6 that is turned on and off by a trigger 5. When the operator operates the trigger 5, the motor 19 is activated. When the motor 19 is activated, the rotation of the output shaft 19c is transmitted to the first drive shaft 30 via the pinion gear 19e and the first gear 31, causing the first drive shaft 30 to rotate.

[0031] When the first drive shaft 30 rotates, the eccentric pin 32 provided at the upper end of the first drive shaft 30 rotates around the central axis of the first drive shaft 30 as its axis of rotation. That is, the eccentric pin 32 orbits around the central axis of the first drive shaft 30. As a result, the piston 9, which is connected to the eccentric pin 32 via the connecting rod 33, reciprocates within the cylinder 17. When the piston 9 moves away from the striker 22, that is, when the piston 9 retreats, the pressure of the compressed air 20 in the air chamber 23 decreases, causing the striker 22 to retreat. On the other hand, when the piston 9 moves toward the striker 22, that is, when the piston 9 advances, the pressure of the compressed air 20 in the air chamber 23 increases, causing the striker 22 to advance. When the striker 22 advances, the striker 22 strikes the second hammer 24, which in turn strikes the tool bit 8. In this manner, striking force is intermittently transmitted to the tool bit 8.

[0032] When the second drive shaft 40 rotates, the bevel gear 42 provided at the upper end of the second drive shaft 40 rotates, causing the ring gear 43 meshing with the bevel gear 42 to rotate. The rotation of the ring gear 43 is then transmitted to the cylinder 17 via the clutch 44, causing the cylinder 17 and the retainer sleeve 25 to rotate integrally. As a result, an impact force is transmitted intermittently and a rotational force is transmitted continuously to the tool bit 8 held by the retainer sleeve 25. As a result, the tool bit 8 performs a desired operation on the target object.

[0033] An operating lever 11 that can switch the operation mode of the hammer drill 10 is provided on the upper part of the work machine body 1 of the hammer drill 10. By operating this operating lever 11, the transmission of rotation of the ring gear 43 can be interrupted by the clutch 44. This allows the operator to switch the operation mode of the hammer drill 10 between a hammer mode in which a striking force is applied to the bit 8 without a rotational force, and a hammer drill mode in which both a rotational force and a striking force are applied to the bit 8.

[0034] As shown in FIG. 2, the hammer drill 10 of the first embodiment has a battery attachment housing (second housing) 16 as a housing connected to the handle housing 12 that forms the outer shell of the handle 2. The battery attachment housing 16 is made up of a right battery attachment housing 16c and a left battery attachment housing 16d. The battery attachment housing 16 includes a battery attachment section 26 to which the battery pack 3 can be attached. That is, the battery pack 3 can be attached to the battery attachment section 26. The battery pack 3 has a supported section 3a on the top surface, and the supported section 3a is fitted into the battery attachment section 26 and is supported by the battery attachment section 26.

[0035] 3, the battery mounting section 26 is located below the handle section 2 in the vertical direction Q1. When the battery pack 3 is mounted in the battery mounting section 26, the battery pack 3 is located below the battery mounting section 26 in the vertical direction Q1.

[0036] The handle portion 2 also has a connection portion 12d at its upper portion that is connected to the work machine body 1.

[0037] 2, the hammer drill 10 has an elastic body 21 interposed between the handle housing 12 and the battery mounting housing 16. The elastic body 21 is made of rubber or the like, has a ring shape, and is strung together like beads.

[0038] Furthermore, the handle housing 12 has a handle side wall (first extending wall) 12c that is connected to a base 12e (see FIG. 4) of the handle housing 12 and extends in the up-down direction Q1. The handle side wall 12c is formed in a cylindrical shape at the lower end of the handle housing 12.

[0039] Meanwhile, the battery attachment housing 16 has a battery attachment sidewall (second extending wall) 16e that extends in the up-down direction Q1 and has an elastic body 21 interposed between it and the handle sidewall 12c. The battery attachment sidewall 16e is also formed in a cylindrical shape, similar to the handle sidewall 12c. As shown in FIGS. 4 and 5, the battery attachment housing 16 accommodates the handle sidewall 12c inside the radial direction S1 of the battery attachment housing 16 with the battery attachment sidewall 16e and the handle sidewall 12c engaged with each other via the elastic body 21.

[0040] That is, the cylindrical battery mounting portion side wall portion 16e and the cylindrical handle portion side wall portion 12c are arranged opposite each other with an elastic body 21 sandwiched between the battery mounting portion side wall portion 16e and the handle portion side wall portion 12c, and the handle portion side wall portion 12c is arranged inside the battery mounting portion side wall portion 16e.

[0041] Here, the handle portion side wall portion 12c has a handle portion upper side wall portion (first one side wall portion) 12a located on the upper side (one side) of the elastic body 21 in the vertical direction Q1, and a handle portion lower side wall portion (first other side wall portion) 12b located on the lower side (other side) of the elastic body 21 in the vertical direction Q1.

[0042] 2, handle portion sidewall 12c includes a horizontally elongated handle portion upper sidewall 12a disposed above elastic body 21, and a horizontally elongated handle portion lower sidewall 12b disposed below elastic body 21. Handle portion upper sidewall 12a and handle portion lower sidewall 12b are each horizontally elongated wall portions that protrude from handle portion sidewall 12c. In other words, handle portion upper sidewall 12a and handle portion lower sidewall 12b protruding from handle portion sidewall 12c are arranged alternately above and below in the arrangement direction.

[0043] On the other hand, the battery attachment housing 16 is located on the lower side (the other side) of the elastic body 21 in the vertical direction Q1, and has a battery attachment lower side wall portion (second other side wall portion) 16a that interposes the elastic body 21 between itself and the handle upper side wall portion 12a. Furthermore, the battery attachment housing 16 is located on the upper side (one side) of the elastic body 21 in the vertical direction Q1, and has a battery attachment upper side wall portion (second one side wall portion) 16b that interposes the elastic body 21 between itself and the handle lower side wall portion 12b.

[0044] 2, the battery mounting portion side wall 16e includes a horizontally elongated battery mounting portion lower side wall 16a disposed below the elastic body 21, and a horizontally elongated battery mounting portion upper side wall 16b disposed above the elastic body 21. The battery mounting portion lower side wall 16a and the battery mounting portion upper side wall 16b are each horizontally elongated walls that protrude from the battery mounting portion side wall 16e. In other words, the battery mounting portion lower side wall 16a and the battery mounting portion upper side wall 16b that protrude from the battery mounting portion side wall 16e are arranged alternately above and below in the arrangement direction.

[0045] 4, the elastic body 21 is sandwiched and supported between the handle portion upper side wall 12a and the battery mounting portion lower side wall 16a in a region closer to the front of the handle portion side wall 12c and the battery mounting portion side wall 16e (a region including line AA in FIG. 3). Furthermore, as shown in FIG. 5, the elastic body 21 is sandwiched and supported between the handle portion lower side wall 12b and the battery mounting portion upper side wall 16b in a region closer to the rear of the handle portion side wall 12c and the battery mounting portion side wall 16e (a region including line BB in FIG. 3).

[0046] As described above, the handle portion upper sidewall 12a and handle portion lower sidewall 12b protruding from the handle portion sidewall 12c, and the battery mounting portion lower sidewall 16a and battery mounting portion upper sidewall 16b protruding from the battery mounting portion sidewall 16e, are arranged alternately above and below in the arrangement direction. The elastic body 21 is sandwiched at its upper and lower sides by these alternately arranged walls. That is, the elastic body 21 protrudes from each of the handle portion sidewall 12c and the battery mounting portion sidewall 16e, and is sandwiched between the alternately arranged walls above and below in the arrangement direction.

[0047] As a result, in the hammer drill 10, the elastic body 21 can be deformed in response to vibrations in the up-down direction Q1, and therefore, vibration damping effects in the up-down direction Q1 can be obtained.

[0048] 4 and 5, the elastic body 21 is sandwiched between the handle portion side wall 12c and the battery mounting portion side wall 16e in the left-right direction R1. Therefore, the elastic body 21 can be deformed in response to vibrations in the left-right direction R1, and therefore, a vibration-damping effect in the left-right direction R1 can be obtained.

[0049] Here, the elastic body 21 includes a first intermediate portion 21a interposed between the handle portion upper sidewall 12a and the battery mounting portion lower sidewall 16a, and a second intermediate portion 21b interposed between the handle portion lower sidewall 12b and the battery mounting portion upper sidewall 16b. The first intermediate portion 21a and the second intermediate portion 21b are an integrally molded single resin component. That is, the elastic body 21 includes the first intermediate portion 21a and the second intermediate portion 21b and is made of resin, and is an integrally molded component connected in a ring shape, as shown in FIG. 2. The ring-shaped elastic body 21 is interposed between the cylindrical handle portion sidewall 12c disposed on the inside and the cylindrical battery mounting portion sidewall 16e disposed on the outside.

[0050] The handle portion sidewall 12c and the battery mounting portion sidewall 16e, which are located on opposite sides of the handle portion sidewall 12c and the battery mounting portion sidewall 16e in the left-right direction R1, also have a similar vertically staggered wall structure. That is, the handle portion upper sidewall 12a and the handle portion lower sidewall 12b, which protrude from the handle portion sidewall 12c, are vertically staggered in the arrangement direction, and the battery mounting portion lower sidewall 16a and the battery mounting portion upper sidewall 16b, which protrude from the battery mounting portion sidewall 16e, are vertically staggered in the arrangement direction. The elastic body 21 is sandwiched between the handle portion upper sidewall 12a and the battery mounting portion lower sidewall 16a, and is also sandwiched between the handle portion lower sidewall 12b and the battery mounting portion upper sidewall 16b.

[0051] The handle portion sidewall 12c and the battery mounting portion sidewall 16e in the left-right direction R1 shown in FIG. 2 also have a similar vertically staggered wall structure. Specifically, as shown in FIGS. 6 to 8, on the wall on the front side in the front-rear direction P1, the handle portion upper sidewall 12a and the handle portion lower sidewall 12b protruding from the handle portion sidewall 12c are vertically staggered in the arrangement direction. Furthermore, the battery mounting portion lower sidewall 16a and the battery mounting portion upper sidewall 16b protruding from the battery mounting portion sidewall 16e are vertically staggered in the arrangement direction. As a result, the elastic body 21 is sandwiched between the handle portion upper sidewall 12a and the battery mounting portion lower sidewall 16a, and is also sandwiched between the handle portion lower sidewall 12b and the battery mounting portion upper sidewall 16b. This allows the hammer drill 10 to achieve vibration damping in the vertical direction Q1.

[0052] Furthermore, the elastic body 21 is sandwiched between the handle portion side wall 12c and the battery mounting portion side wall 16e in the front-rear direction P1. Therefore, the elastic body 21 can be deformed in response to vibrations in the front-rear direction P1, thereby achieving a vibration damping effect in the front-rear direction P1.

[0053] Additionally, on the rear wall in the front-to-rear direction P1, the handle portion upper sidewall 12a and the handle portion lower sidewall 12b, which protrude from the handle portion sidewall 12c, are arranged alternately up and down in the arrangement direction. Furthermore, the battery mounting portion lower sidewall 16a and the battery mounting portion upper sidewall 16b, which protrude from the battery mounting portion sidewall 16e, are arranged alternately up and down in the arrangement direction. As a result, the elastic body 21 is sandwiched between the handle portion upper sidewall 12a and the battery mounting portion lower sidewall 16a, and is also sandwiched between the handle portion lower sidewall 12b and the battery mounting portion upper sidewall 16b. This allows the hammer drill 10 to achieve vibration damping in the up-down direction Q1.

[0054] Furthermore, at the rear wall in the front-rear direction P1, the elastic body 21 is also sandwiched between the handle portion side wall 12c and the battery mounting portion side wall 16e in the front-rear direction P1. Therefore, the elastic body 21 can deform in response to vibrations in the front-rear direction P1, thereby achieving a vibration damping effect in the front-rear direction P1.

[0055] As shown in FIG. 9, the handle portion upper sidewall 12a protrudes from each of the four sides of the cylindrical handle portion sidewall 12c, which is generally rectangular. The cross-sectional structure of FIG. 9 should include the ring-shaped elastic body 21, but this has been omitted to make the cross-sectional structure of the wall easier to understand. The battery mounting portion upper sidewall 16b protrudes from each of the four sides of the cylindrical battery mounting portion sidewall 16e, which is generally rectangular. As shown in FIGS. 10 and 11, the battery mounting portion lower sidewall 16a is provided opposite the handle portion upper sidewall 12a in the up-down direction Q1, and the handle portion lower sidewall 12b is provided opposite the battery mounting portion upper sidewall 16b. At each side of the cylindrical handle portion side wall portion 12c, which is approximately rectangular, the ring-shaped elastic body 21 is sandwiched between the handle portion upper side wall portion 12a and the battery mounting portion lower side wall portion 16a, and also between the battery mounting portion upper side wall portion 16b and the handle portion lower side wall portion 12b.

[0056] That is, in the hammer drill 10, as shown in FIGS. 9 to 11, at least one of the handle upper side wall portion 12a and the handle lower side wall portion 12b is arranged in plural in the left-right direction R1 or the front-rear direction P1.

[0057] According to the hammer drill 10 of the first embodiment, the handle portion upper sidewall 12a and the handle portion lower sidewall 12b, which extend from the handle portion sidewall 12c, and the battery mounting portion lower sidewall 16a and the battery mounting portion upper sidewall 16b, which extend from the battery mounting portion sidewall 16e, are arranged alternately in the vertical direction. As a result, the elastic body 21 is sandwiched between the upper and lower walls arranged alternately in the vertical direction. As a result, the elastic body 21 can deform in response to vibrations in the vertical direction Q1, thereby achieving a vibration-damping effect in the vertical direction Q1.

[0058] Furthermore, since the elastic body 21 is sandwiched between the handle portion side wall portion 12c and the battery mounting portion side wall portion 16e in the left-right direction R1, the elastic body 21 can deform in response to vibrations in the left-right direction R1, thereby achieving a vibration-damping effect in the left-right direction R1.

[0059] Furthermore, the elastic body 21 is sandwiched between the handle portion side wall portion 12c and the battery mounting portion side wall portion 16e in the front-to-back direction P1 as well, and therefore the elastic body 21 can deform in response to vibrations in the front-to-back direction P1, thereby achieving a vibration-damping effect in the front-to-back direction P1.

[0060] The elastic body 21 is a ring-shaped, integrally molded product. That is, unlike multiple elastic bodies provided in different directions, the elastic body 21 is a single resin part, which allows for miniaturization of the elastic body 21.

[0061] Therefore, the hammer drill 10 can achieve vibration reduction effects in three directions (up and down, left and right, and front and back) while achieving a compact size. As a result, the hammer drill 10 can be prevented from becoming large, and its usability can be improved.

[0062] Furthermore, the handle upper sidewall 12a and the handle lower sidewall 12b, and the battery mounting lower sidewall 16a and the battery mounting upper sidewall 16b are arranged alternately up and down in the arrangement direction. This allows the elastic body 21 to maintain a uniform vibration-damping effect in the front-to-back direction P1 and the left-to-right direction R1 of the battery mounting section 26, while making it possible to uniformly deform the elastic body 21 in response to vibrations in the up-to-down direction Q1, the front-to-back direction P1, and the left-to-right direction R1. As a result, it is possible to use an elastic body 21 that is an integrally molded product connected in a ring shape, and the size of the elastic body 21 can be reduced.

[0063] Moreover, because the handle upper sidewall 12a and the handle lower sidewall 12b, and further the battery mounting portion lower sidewall 16a and the battery mounting portion upper sidewall 16b, are arranged alternately up and down in the arrangement direction, when the battery mounting portion 26 moves upward, the handle upper sidewall 12a and the battery mounting portion upper sidewall 16b compress the elastic body 21. Furthermore, when the battery mounting portion 26 moves downward, the handle lower sidewall 12b and the battery mounting portion lower sidewall 16a compress the elastic body 21.

[0064] This allows the elastic body 21 to be deformed in response to vibrations in the up-down direction Q1 caused by the battery mounting part 26, and the vibrations in the up-down direction Q1 caused by the battery mounting part 26 can be alleviated.

[0065] Furthermore, even if the vibration of the battery mounting section 26 is uneven depending on the orientation or position at which the battery pack 3 is inserted into the battery mounting section 26, the optimal vibration-damping effect can be obtained in the hammer drill 10 by changing the alternating ratio between the handle upper side wall portion 12a and the handle lower side wall portion 12b, and between the battery mounting section lower side wall portion 16a and the battery mounting section upper side wall portion 16b.

[0066] (Embodiment 2) In the second embodiment, a hammer drill 50 will also be described as an example of a work machine.

[0067] The hammer drill 50 shown in FIG. 12 is a work machine having substantially the same structure as the hammer drill 10 of the first embodiment. Specifically, the hammer drill 50 includes a work machine body 1, an electric motor 19 as a power source, and a tool bit 8 that can contact a mating member. The tool bit 8 is, for example, a bit, and is detachably attached to the work machine body 1. The hammer drill 50 also includes a drive unit 4 disposed below the work machine body 1 and a handle unit 2 connected to the work machine body 1. The outer shell of the work machine body 1 is composed of a cylinder housing 1a, an intermediate housing 1b, and a motor housing 1c, which are fixed to each other and integrated. The handle unit 2 is gripped by the operator and includes a handle unit housing (first housing) 12 that forms the outer shell of the hammer drill 50. In other words, the hammer drill 50 includes the cylinder housing 1a, the intermediate housing 1b, the motor housing 1c, and the handle unit housing 12 as the first housing that forms the outer shell of the hammer drill 50.

[0068] The cylinder housing 1a is cylindrical as a whole. The intermediate housing 1b and the motor housing 1c are disposed between one longitudinal end of the cylinder housing 1a and the handle section 2. The intermediate housing 1b and the motor housing 1c are disposed between the rear end of the cylinder housing 1a and the handle section 2. The intermediate housing 1b and the motor housing 1c are stacked one on top of the other, with one end of the handle section 2 connected to the motor housing 1c and the other end of the handle section 2 connected to the intermediate housing 1b.

[0069] The hammer drill 50 also has a rotational force transmission unit 14 that applies a rotational force to the tool bit 8 using the driving force of the motor 19, an impact force transmission unit 15 that applies an impact force to the tool bit 8 using the driving force of the motor 19, and a control unit 13 that controls the rotational force and impact force transmitted to the tool bit 8. The control unit 13 controls the driving force of the motor 19, thereby controlling the rotational force and impact force transmitted to the tool bit 8.

[0070] A battery attachment section 26 connected to the handle section 2 is provided at the bottom of the handle section 2. The battery attachment section 26 is included in a battery attachment section housing (second housing) 16 that forms the outer shell of the battery attachment section 26. A battery pack 3, which serves as a power source, can be attached to the battery attachment section 26. The battery pack 3 supplies power to the motor 19. The handle section 2 is also provided with a trigger switch 6 that is turned on and off by a trigger 5. When the operator operates the trigger 5, the motor 19 starts operating.

[0071] The detailed configurations and operations of the rotational force transmission unit 14, impact force transmission unit 15, reciprocating mechanism unit 18, etc. of the hammer drill 50 of the second embodiment will be explained below in the same manner as those of the hammer drill 10 of the first embodiment, and therefore will not be explained again. Furthermore, the operating units of the hammer drill 50 (the gears, piston 9, and cylinder 17 that operate by receiving the driving force of the motor 19) are also explained in the same manner as those of the hammer drill 10 of the first embodiment, and therefore will not be explained again.

[0072] 13 and 14, the hammer drill 50 of the second embodiment also has an elastic body 21 interposed between the handle housing 12 and the battery attachment housing 16. The elastic body 21 is made of rubber or the like, and is a single ring-shaped resin part connected in a beaded pattern. In other words, the elastic body 21 is a ring-shaped, one-piece molded product.

[0073] 13, the handle housing 12 disposed on the right side and the handle housing 12 disposed on the left side are assembled with bolts 27. As shown in Fig. 14, the handle housing (first housing) 12 has a base (first base) 12e extending in the left-right direction R1, and a protruding portion 12f protruding from the base 12e so that an upper side (one side) in the up-down direction Q1 is connected to the base 12e. That is, the handle housing 12 has the base 12e and the protruding portion 12f.

[0074] 13, the battery attachment section housing (second housing) 16 has a base (second base) 16f and a hole 16g that is provided in the base 16f and into which the protrusion 12f is inserted downward (to the other side) in the up-down direction Q1. That is, the battery attachment section housing 16 has the base 16f and the hole 16g.

[0075] 14, the protrusion 12f has a handle portion upper sidewall portion (first one sidewall portion) 12g extending in the left-right direction R1. Meanwhile, the hole 16g has a battery mounting portion lower sidewall portion (second other sidewall portion) 16h extending in the left-right direction R1 and positioned below the handle portion upper sidewall portion 12g in the up-down direction Q1, and sandwiching the elastic body 21 between the hole 16g and the handle portion upper sidewall portion 12g.

[0076] The handle housing 12 and the battery attachment housing 16 are provided with removal prevention portions 12h, 16i that prevent the protrusion 12f from removing from the hole 16g when the handle housing 12 and the battery attachment housing 16 abut against each other without the aid of the elastic body 21. In detail, the handle housing 12 and the battery attachment housing 16 are assembled together with the handle housing 12 inserted into the hole 16g of the battery attachment housing 16 from above.

[0077] Here, even if an external force is applied so as to move the handle housing 12 upward relative to the battery attachment housing 16, the detachment prevention portion 12h of the handle housing 12 abuts against the detachment prevention portion 16i of the battery attachment housing 16, thereby preventing the protrusion 12f of the handle housing 12 from slipping upward through the hole 16g of the battery attachment housing 16. Furthermore, because the detachment prevention portion 12h and the detachment prevention portion 16i are provided solely to prevent the protrusion 12f from detaching from the hole 16g, there is no need to provide an elastic body between the detachment prevention portion 12h and the detachment prevention portion 16i. The configuration in which the detachment prevention portion 12h and the detachment prevention portion 16i abut directly without the intermediary of the elastic body 21 contributes to the miniaturization of the elastic body 21 and the overall miniaturization of the hammer drill 10.

[0078] 13 to 15, the handle housing 12 has a handle sidewall (first extending wall) 12i extending in the up-down direction Q1. On the other hand, the battery attachment housing 16 has a battery attachment sidewall (second extending wall) 16j extending in the up-down direction Q1 and having an elastic body 21 interposed between the battery attachment sidewall 12i and the handle sidewall 12i, as shown in FIGS.

[0079] The handle side wall 12i and the battery mounting side wall 16j each have fitting grooves 12j, 16k into which the elastic body 21 is fitted in the left-right direction R1. That is, the handle side wall 12i has the fitting groove 12j into which the elastic body 21 is fitted in the left-right direction R1, while the battery mounting side wall 16j has the fitting groove 16k into which the elastic body 21 is fitted in the left-right direction R1.

[0080] As a result, when the elastic body 21 is fitted into the fitting grooves 12j, 16k of the handle portion side wall portion 12i and the battery mounting portion side wall portion 16j, the elastic body 21 is sandwiched between the handle portion side wall portion 12i and the battery mounting portion side wall portion 16j.

[0081] 13, 15, and 16, the elastic body 21 is sandwiched between the fitting groove 12j of the handle sidewall 12i and the fitting groove 16k of the battery mounting sidewall 16j. This allows the elastic body 21 to deform in response to vibrations in the up-down direction Q1 and also in the left-right direction R1. Therefore, the hammer drill 50 can achieve vibration damping effects in both the up-down direction Q1 and the left-right direction R1.

[0082] The elastic body 21 is sandwiched between the handle side wall 12i and the battery mounting side wall 16j in the front-rear direction P1, thereby providing the hammer drill 50 with a vibration damping effect in the front-rear direction P1.

[0083] The hammer drill 50 of the second embodiment can also achieve vibration damping effects in the up-down direction Q1, the left-right direction R1 and the front-rear direction P1.

[0084] Furthermore, the elastic body 21 is a ring-shaped, integrally molded product. That is, unlike multiple elastic bodies provided in different directions, the elastic body 21 is a single resin part, which allows for miniaturization of the elastic body 21.

[0085] Therefore, the hammer drill 50 can be made compact and still achieve vibration reduction effects in three directions (up and down, left and right, and front and back). As a result, it is possible to prevent the hammer drill 50 from becoming too large and thereby improve its usability.

[0086] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present invention. For example, the first housing may be the main body housing, the second housing may be the handle housing, and an elastic body may be interposed between the main body housing and the handle housing to reduce vibrations acting on the handle. [Explanation of symbols]

[0087] 1...working machine body, 1a...cylinder housing, 1b...intermediate housing, 1c...motor housing, 2...handle portion, 3...battery pack, 3a...supported portion, 4...drive portion, 5...trigger, 6...trigger switch, 7...tipped tool holding portion, 8...tipped tool, 9...piston, 10...hammer drill (working machine), 11...operating lever, 12...handle portion housing (first housing), 12a...handle portion upper side wall portion (first one side wall portion), 12b...handle portion lower side wall portion (first other side wall portion), 12c...handle portion Side wall portion (first extending wall portion), 12d...connecting portion, 12e...base portion (first base portion), 12f...projecting portion, 12g...handle portion upper side wall portion (first one side wall portion), 12h...detachment prevention portion, 12i...handle portion side wall portion (first extending wall portion), 12j...fitting groove, 13...control portion, 14...rotational force transmission portion, 15...impact force transmission portion, 16...battery attachment portion housing (second housing), 16a...battery attachment portion lower side wall portion (second other side wall portion), 16b...battery attachment portion upper side wall portion (second one side wall portion), 16c...battery attachment portion right side housing, 16d...battery mounting portion left housing, 16e...battery mounting portion side wall portion (second extension wall portion), 16f...base portion (second base portion), 16g...hole portion, 16h...battery mounting portion lower side wall portion (second other side wall portion), 16i...detachment prevention portion, 16j...battery mounting portion side wall portion (second extension wall portion), 16k...fitting groove, 17...cylinder, 18...reciprocating mechanism portion, 19...motor, 19a...stator, 19b...rotor, 19c...output shaft, 19d...fan, 19e...pinion gear, 20...compressed air, 21...elastic body, 21a...first intermediate portion, 21b...second intermediate portion, 22...striker, 23...air chamber, 24...second hammer, 25...retainer sleeve, 26...battery mounting portion, 27...bolt, 30...first drive shaft, 31...first gear, 32...eccentric pin, 33...connecting rod, 40...second drive shaft, 41...second gear, 42...bevel gear, 43...ring gear, 44...clutch, 50...hammer drill (work machine), C1, D1...axis, P1...front-rear direction, Q1...up-down direction (first direction), R1...left-right direction (second direction), S1...radial direction

Claims

1. A motor; an operating unit that operates by receiving a driving force from the motor; a first housing supporting the motor; a second housing connected to the first housing; an elastic body interposed between the first housing and the second housing, The first housing includes: a first one side wall portion located on one side in a first direction with respect to the elastic body; a first other-side wall portion located on the other side of the elastic body in the first direction, The second housing includes: a second other-side wall portion located on the other side of the elastic body in the first direction and interposing the elastic body between the second other-side wall portion and the first one-side wall portion; a second one-side wall portion located on one side of the elastic body in the first direction and interposing the elastic body between the second one-side wall portion and the first other-side wall portion.

2. The work machine according to claim 1 , wherein at least one of the first one side wall portion and the first other side wall portion is arranged in a plurality of portions in a second direction perpendicular to the first direction.

3. the first housing has a first extending wall portion extending along the first direction, The work machine according to claim 2 , wherein the second housing has a second extending wall portion that extends along the first direction and interposes the elastic body between the second extending wall portion and the first extending wall portion.

4. The first extending wall portion is formed in a cylindrical shape, The work machine according to claim 3 , wherein the second extending wall portion is formed in a cylindrical shape and accommodates the first extending wall portion radially inward.

5. a battery pack for supplying power to the motor; The work machine according to claim 1 , wherein the second housing includes a battery mounting portion to which the battery pack can be attached.

6. the first housing includes a handle portion that is gripped by an operator; The work machine according to claim 5 , wherein the battery mounting portion is located on the other side of the handle portion in the first direction.

7. the elastic body includes a first intermediate portion interposed between the first one-side wall portion and the second other-side wall portion, and a second intermediate portion interposed between the first other-side wall portion and the second one-side side wall portion, The work machine according to claim 1 , wherein the first intermediate portion and the second intermediate portion are integrally molded as a single component.

8. A motor; an operating unit that operates by receiving a driving force from the motor; a first housing supporting the motor; a second housing connected to the first housing; an elastic body interposed between the first housing and the second housing, The first housing includes: A first base portion; a protrusion protruding from the first base so as to be connected to the first base on one side in a first direction; The second housing includes: A second base; a hole portion provided in the second base portion and into which the protrusion portion is inserted toward the other side in the first direction, the protrusion has a first one-side wall portion extending in a second direction intersecting the first direction, the hole portion extends in the second direction and has a second other-side wall portion located on the other side in the first direction with respect to the first one-side wall portion, and sandwiching the elastic body between the first one-side wall portion and the second other-side wall portion; A work machine in which the first housing and the second housing are provided with a detachment prevention portion that prevents the protrusion from detaching from the hole portion by abutting the first housing and the second housing without the elastic body being interposed between them.

9. the first housing has a first extending wall portion extending along the first direction, the second housing has a second extending wall portion extending along the first direction and interposing the elastic body between the second extending wall portion and the first extending wall portion; each of the first extending wall portion and the second extending wall portion has a fitting groove into which the elastic body is fitted in the second direction; 9. The work machine according to claim 8, wherein when the elastic body is fitted into the fitting groove of each of the first extension wall portion and the second extension wall portion, the elastic body is sandwiched between the first extension wall portion and the second extension wall portion.

Images